Improvement in boring-machines



MILES SWEET, o-r,TR"oY, NEW YORK.

' Laws Patent No. 88,821, daad .41ml 13, 1869.A

IMPROVEMENT IN- BORING-MACHINES The Schedule referred to in these Letters Patent and making part of the same To all lwhom, 'it may concern Be it known that I, MILES SWEET, of the city of Troy, in the county of Rensselaer, and State of New York, have invented'certain new and useful Improvey ments in Boring-Machines, of which the following is This invention consists in the construction and ar-v rangement of devices hereinafter described, `for boring holes in stationary timber in a direction perpendicular to the plane of thesurface of the timber, and at various angles on Atwo opposite sides of Such perpendicular, and also indicating or measuring the degrees of such angles in respect to the plane of the surface of the timber, or to a line perpendicular to'such surface.

In the drawing- C is a base, which has a dat bottom to rest on the timber to be bored, and which forms a seat for a person boring with the machine.-

B B are two parallel and opposite supports, or standards, which are fast on the base C, and which are in the form of inverted arches, with an extension to and around the centre of the circle of each arch.

Ais a frame, or stock, which -has straight ways thereon, and which is pivoted at the centres, and clamped to the rims ofthe inverted arches B B, in such manner that the frame A can be readily turned and adjusted in various positions, so that the straight ways on the frame A shall be either perpendicular to the plane of the bottom .of the base, C, or inclined thereto at various angles in either of two opposite directions.

F is an auger-carriage, carried by and fitted to slide upon the straight ways of the adjustable frame A, and holding a boring-apparatus, which consists of a horizontal rotary'sh'aft, J, which has hand-cranks K K fast 'ther-ecn, and which is geared to a shaft that holds and revolves an auger, H, and moves it endwise with the frame F, in a line parallel to that in which the frame F slides on the frame A.

L is an index-plate, which is fast on or forms a part of one of the inverted arches B, and which is graduated to degrees of an arc of a circle, concentric with the axis on which the frame A is pivoted. 4

M is an index, or pointer, fast on the frame A, and arranged so asto pass along the graduations of the index-plate L, as the frame A is-turned on its pivotcentres in changing its adjustment.

The base, C, inverted arches B, and adjustable frame A, carrying the auger-carriage F, with the boring-apparatus, are all so constructed and arranged, thatwhen the base, C, shall be placed on a stick of timber, and the auger H revolved by a person sitting on the base and turning the cranks K K by hand, the auger will then bore downward into such lstick of timber,'in a direction either perpendicular, or inclined at various angles in two opposite directions, in respect to the plane of the surface of the timber at the place where the base, C, rests .thereon, according to the position in which the frame A shall be adjusted in' respect to the plane of the bottom of they base. And the index M, and the graduations on the index-plate L are so arranged in respect to the plane of the bottom of the base, C, and to the straight line in which the auger H moves endwise with the carriage F, on the adjustable frame A in boring, that, when the axis of the auger and the line of its endwise movement Shall be perpendicular to the plane of the bottom of the base, the fact will be shown on the graduated index-plate L, by the index M, and that when the frame Ashall be adjusted so that the line of endwise movement of the auger shall be inclined on either side -of such perpendicular, the degrees of such inclination in respect to the plane of the bottom of the base, C, or to a line perpendicular thereto, shall be pointed out by the index M upon the graduated plate L. E

.By means of the index M and graduated index-plate L, arranged in connection with the other parts of the machine, as above described and shown by the drawing, the anger can be far more quickly adjusted tobore into timber on which the base, O, of the machine shall be placed, at any particular angle in respect to the plane of the bottom of the base, or to the plane of the surface of the timber at the place where the base shall rest thereon, than could be done without any such arrangement of index and graduated plate. And, in the same machine, by having the adjustable frame A piv` oted at the centres, and clamped to the rims of the inverted arches B, fast on the base, ,G, as above described, the pivot-centres'z' of the frame A are higher above the base, O, than the clamping points d, and are between the clamping-points and the auger-turning crank-shaft J. So that the force which is applied by hand to turn the cranks K K in boring, and the excess of weight in the frame A and its appendages above the pivot-centres i, each has less leverage-power tending to overcome the clamping-devices, and wrench the frame A out of an adj usted position, than would be the case if the arches B were arranged and fastened the other side up on the base, C, so that the claming-points would be between the pivot-centres and the crank-shaft, and higher above the base thanl the pivot-centres, as in some boring-machines heretofore made. y

I pivot and clamp the frame A to the inverted arch supports B, by means of any suitable known devices.

In the drawing, N N, figs'. 2, 5, and 6, are tubular studs, having shanks o, formed with angles or projections p, tted into corresponding recesses q, figs. 2 and Vstuds N, and have screw-threads x, washers y, and nuts I), ou their ends, with the nuts and ivashers screwed tight against the ends of the studs.

T T are bolts, formed and fitted into and extended through the side pieces of the frame A, like the bolts T T, and extended through the curved slots z in the supports B, With scrcwfthreads x', Washers y', aud nuts E E on the outer ends, so as to clamp the frame A tight against the rims e e ot' the inverted arches.

In tig. 1, the index M is shown clamped fast between a washer, y, and the end of one of the studs, N, so that the index must turn with the frame A in adjusting the latter.

Vhat I claim as my invention, and desire to secure by Letters Patent, is 4 The arrangement of the base, C, inverted arches B, and graduated index-plate L, in connection with index M and adjustable frame A, carrying the auger-carriage F, with boi-ing-apparatus, all constructed and operated as shown and described, for the purpose set forth.

In testimony whereof, I hereunto set my hand, this 26th day of January, 1867.

MILES SWEET.

Witnesses:

WM. P. S. MELVIN, AusrufJ F. PARK. 

